Where's the location of the app/binary defined in a yocto recipe? - embedded-linux

Question

I have a following recipe which runs a said service which in turns runs an app on boot-up, but I am trying to understand where the location of the app defined which ends up in sysfs image.
Currently, the appSource binary (defined in Makefile) gets stored in /usr/bin but I'm not sure where the destination location (/usr/bin) is defined.
The following command results in
$ bitbake -e appSource | grep ^FILES_${PN}
FILES_appSource="/usr/bin/* /usr/sbin/* /usr/libexec/* /usr/lib/lib*.so.* /etc /com /var /bin/* /sbin/* /lib/*.so.* /lib/udev /usr/lib/udev /lib/udev /usr/lib/udev
Here's the recipe
inherit autotools-brokensep pkgconfig
DESCRIPTION = "A sample recipe"
LICENSE = "CLOSED"
DEPENDS = "glib-2.0"
FILESPATH =+ "${THISDIR}:"
SRC_URI = "file://appSource"
S = "${WORKDIR}/appSource""
FILES_${PN} += "${systemd_unitdir}/*"
INIT_MANAGER = "systemd"
do_install_append() {
if ${#bb.utils.contains('DISTRO_FEATURES', 'systemd', 'true', 'false', d)}; then
install -d ${D}/etc/initscripts
install -d ${D}${systemd_unitdir}/system
install -m 0644 ${WORKDIR}/appService/appService.service ${D}${systemd_unitdir}/system/appService.service
install -d ${D}${systemd_unitdir}/system/multi-user.target.wants/
ln -sf ${systemd_unitdir}/system/appService.service ${D}${systemd_unitdir}/system/multi-user.target.wants/appService.service
fi
}

Answer 1

Here is what I find out:
You are inheriting autotools-brokensep which has the following content:
# Autotools class for recipes where separate build dir doesn't work
# Ideally we should fix software so it does work. Standard autotools supports
# this.
inherit autotools
B = "${S}"
So, it inherit autotools which has do_install with the content of:
autotools_do_install() {
oe_runmake 'DESTDIR=${D}' install
# Info dir listing isn't interesting at this point so remove it if it exists.
if [ -e "${D}${infodir}/dir" ]; then
rm -f ${D}${infodir}/dir
fi
}
So, it runs the install target of your Makefile into ${D} which is ${WORKDIR}/image.
So, I assume that your Makefile has an install target that copies the binary into /usr/bin.
For the FILES variable content, this is defined in bitbake.conf:
FILES_${PN} = "${bindir}/* ${sbindir}/* ${libexecdir}/* ${libdir}/lib*${SOLIBS} \ ...
Provide your Makefile to confirm my assumption, or I do a further research on the topic.